Needle Valve and Variable Restrictor Valve
Needle valve cross section
Needle valve has the same working principle with globe valve; the most obvious different is needle valve uses long tapered point at valve stem end instead of disk on globe valve.
Needle valve is suitable to use as a throttle valve since it has smaller seating surface area. Needle valve can be used to protect gauges by providing flow control to the gauge to prevent sudden surge pressure.
A variable restrictor valve is a modified needle valve. This valve doesn’t have any hand wheel but it be adjusted to provide specific rate of low which provide desired time of operation.
Variable restrictor valve
Categories: Flow Control Valves | Tags: Needle Valve, Variable Restrictor Valve | Leave a comment